Maps without a projection reference (e.g. planimetricmaps, town plans). Most of the cartographic material of the National Archives are maps without a projection reference. This type of maps are reduced representation of spatial phenomena in the conventional orthographic projection where the curvature of the Earth is excluded. From those planimetric maps are showing only the horizontal positions for features represented, distinguished from a topographic map by the omission of relief in measurable form.
In historical perspective it is often problematic to distinguish maps without projection reference from the others by looking only at their original titles. For example “geometric map” (Geometrische Charte or Geometrisk Charta) refers to a large-scale cadastral map from the Swedish era (1: 10400, 5200, etc.) while “geographical map” (Geografisk Charta) refers to a small-scale (1: 52000, etc.) cadastral map, both without a projection reference.
Maps with projection reference (e.g. charts, modern maps). Those maps are graphic representation of the physical features (natural, artificial, or both) of the whole or one part of the Earth's surface, by means of signs and symbols, at an established scale, on a specified projection (representation is mathematically defined) and with the means of orientation indicated. Only a small part of manuscript maps has specified projection. On the whole, maps covering a large geographic area (province, country) take into account the modern mathematical knowledge on the shape of the Earth, even if it is not recorded on maps. Triangulation which started in the 19th century raised the level of preparation of maps and charts. Topographic maps, nautical charts and small-scale (less than 1:100 000) maps can be classified as maps with projection reference.
Panoramic drawing is considered also cartographic material, since it shows spatial relationships in three dimensions (urban views, scenery, etc.).
Profile is a representation of the intersection between a moving vertical or normal straight line and a portion of the surface of the Earth or of an underlying stratum. Alternatively, a representation of the intersection of a developable surface with the Earth's surface. This is a very common presentation of road construction works.
Diagram is a graphic chart that contains data related to geographical space.
Table includes data related to geographical space.
Other – the documents that do not fit the previous categories.